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陕南低山丘陵区是长江流域水土流失最为严重的区域之一。防护林体系是改善环境，恢复生态平衡的关键性措施。对陕南低山丘陵区防护林体系进行层次分析表明，本区防护林体系建设应以发展经济林为突破口，用材林、防护林、薪炭林并重，各林种的相对权值分别为４０．３３％、２３．５２％、２８．６１％和７．５４％。在树种选择上应首先考虑柑桔、桃、杏、马尾松、油松、华山松、杉木、水杉、刺楸、樱桃、栎类、漆树、刺槐、杜仲、红椿、茶等树种，以使防护林体系总体功能最优，效益最大。
The hilly area in southern Shaanxi is one of the areas with the most serious soil and water loss in the Yangtze River basin. Shelterbelt system is a key measure to improve the environment and restore ecological balance. Hierarchical analysis of the shelter forest system in the hilly area of southern Shaanxi shows that the development of the shelterbelt system in this area should take the development of economic forest as the breakthrough point, with the timber forests, shelterbelts and firewood forests being equally important, with the relative weights of 40.33% and 23 respectively. 52%, 28.61% and 7.54%. In the selection of tree species, citrus, peach, apricot, Pinus massoniana, Pinus tabulaeformis, Pinus armandii, Chinese fir, Metasequoia glyptostroboides, cherry, oak, tree, locust, Eucommia, The overall function of shelterbelt system is the most effective and most effective.